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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88de16d6f0c655656289f7fc0658066da21db936ed77c824dcbfea129561fe1' 
  AND token = 'ATnBI0OMIxLOKBXw9tL/2f/i3fT6q/LyKPrqBLSLhL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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