The delay before notifications are sent is intentional.
No you can’t pay to get data from the API faster.
If you require faster notification of a stream going live/offline you should work with the broadcaster and have them run an app or plugin that will send a notification directly to your server when they go live/offline.
You can read more about the reasoning behind why Stream Change notifications take as long as they do in a similar thread that was discussed recently: Twitch webhook subscription gets created successfully but my server is not receiving updates