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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863c2b0dd10900e3ef5a2bf0afa0f6f431618f76f320e8a43ad08e7d848543ee' 
  AND token = 'XqVChjUMKBVErNtI3yMCtIptP0FRxOG2Z3b5Iw0IKFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables