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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afd8a62746899d451165fe51ee4bdf8525ad87351ef189fd392ed1c35978cb3' 
  AND token = 'oH4f9ObhvXcZEwKa2I4Tsc1rRIqANxSXDxiJMGpCkbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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