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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bea15764be11cc8a301f9036c5d6ac536614abe1290e0fe2dae5bed91289c6' 
  AND token = 'dlQ9P5lK9Xx25Q4oS6pvwhbw8iDxB1IM98QdsR7Aye8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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