No, but the quickest way at present would be to click in the view pane (it not already in focus), Cmd+F, type the prototype name** in the search box and hit Return. Double-click the item when listed in the pop-up dialog of Find results.
** I try to keep my prototype names short so they are easier/quicker to type out.
Another method is to keep the prototypes folder hoisted in a separate tab. To edit a note’s prototype’s KAS, switch to that tab. Make the edit and switch back. The only problem I find is that tabs often fail to keep their own focus - i.e. if i select a new note in the prototype tab, my previous tab now focusses on what I just edited and loses my previous context. this is a big time-waster and a main reason I use multiple tab/windows far less than I’d otherwise do. Having windows & tabs hold their own focus - or have a doc settings option to allow this would be an awesome productivity buff.
However, at present, there is no “show this item’s prototype” menu option. I too quite often have the same use case. Indeed, more than this I’d love a way to edit the prototype’s attributes in a new (stand-alone?) window so as not to lose current focus. IOW, an ‘edit prototype’ feature.