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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd748a6936d638bc92551fd7b3f8b2b142c4d2593b206defa258a9f464e6a93c9' 
  AND token = 'Pwr2zH8KT1IrvdJpMQIMkZVIcb5H6Q8dUYk26fEmbA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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