Vision is worthy (in the eyes of Odin's enchantment).
Proof from the movie:
The original plan was taking the yellow mind stone to Asgard, but in the end Thor himself said that Vision was worthy so he could let him keep the Infinity Stone. This proves the point.
and
A side note: Thor's lightning just provided power to the system. A moment ago, Quicksilver unplugged power cables from the system.