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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91c51cbf7dfdeb48d1825838f8cc3d74467fd61704d0315101f87e234cc5e63' 
  AND token = '+5YZ8cnQihy4vPb7UkbljBux9pE9Z7e9kWZVbT5h0u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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