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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38c56c5346ec463ff0946a5652895d8fa91edb01914db0e376336e8fac5e91b' 
  AND token = 'hB3BdxA323d2D6lmBtrgl2Q3XVhulRtc9NiBUJScLW4=' 
  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