Yes. Here it is. The one on the far left floats on all screen. This is a screen shot of my home screen. I can't see anything to disable it in settings for LastPass or general app settings.
There is an easier way to get rid of this icon:
1. Go to settings (you can get this by pulling down the drawer from the top of the screen, twice, then tapping the gear icon)
2. Select Accessibility
3. Tap LastPass (even if it says it is 'Off')
4. Set the LastPass shortcut is to Off
That's it. Click the back button or go back to the home screen.