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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed0bd1c3e0127549b29850ff3bd093386bb736eda9adc92c0716d21e64a9039' 
  AND token = 'aM9rCzKP4Pq3in9fwsZ9wIgjLvL3MPzI2UxV8zfgTRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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