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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00268a30174f72d46ca4ffa1efa0ee5ebd71563a2934627c213936f708a7e6d' 
  AND token = 'gllxf5CWLlFCyniSgRuBR3dTBICemXkUmphdyuYoimM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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