Keyboard shortcut to lock the keyboard, without locking the screen? My cat keeps walking over my keyboard.

Is it possible to lock the keyboard with a keyboard short cut but leave the screen running and all apps visible?
You can use KeyboardCleanTool (made by the developer of BetterTouchTool).

It opens the application window with a button you have to press in order to lock/unlock the keyboard.

Download it from BetterTouchTool.net