No, you can't pay your ISP to get "faster internet", only to get more bandwidth between your wall and whatever backhaul provider owns the physical fiber lines. There is no way to make the internet "faster" other than reducing the number of hops you have to make to get to the destination, or by increasing the speed of packets on the networks, which should already be roughly speed of light. Therefore if they are proposing "fast lanes" it isn't about speeding you up, but rather about slowing everyone else down.
Net Neutrality doesn't prevent ISPs from selling more bandwidth to netflix, it only prevents ISPs from treating the traffic differently due to the identity of either the sender or the receiver. This means that Comcast can't slow your traffic down just because you are sending data to and receiving data from netflix instead of using Hulu (which they partially own).