This article explains how to disable Control Center on the iPad's lock screen. The instructions in this article apply to iPads running iOS 11 and later.
iPad Mini iOS 7: Enable/Disable Control Center on the Lock Screen
By default, Control Center is accessible while iPad is locked. Swipe down from the top-right corner of the screen to reveal it.
To set Control Center to be unavailable from the lock screen:
Open the iPad Settings app.