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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd096154fffd1a1abdecc5ff33fa7202e67f84ab931c329d45259181cdf18f6d0' 
  AND token = '8CKyr7bQ1sMD2Q46kLZVmOa45u10JyUFetiIaEK4AnY=' 
  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