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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cb8483b1aa27b3babd7ae331523a081d92e1f1d7cfebb37477088b30ccac16' 
  AND token = 'rDDU8Eu3IbaACWYW8pb9C8n8kI2pfzudCcc12XbNCts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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