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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bec5a237871b52598c8a29651ea551a1a909d1f74117a0fbb07598e6c6fe5bc' 
  AND token = 'El8pa1iX6naQiyzoXNjlZeoamNi8fRiF8Y3q7HkMQP4=' 
  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