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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c8e7f2644f1ea61f4ade2f20f90fe32b994dc65d8ce7b2677f3e39c64dbd72' 
  AND token = 'SQsR5SezzBRChSyVQOIwnnoiZonFvfP81huf4B93dLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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