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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19fbcc7289137a2803ea4025409d987ef1c90c5eb62ad028d687dcbaeba249d' 
  AND token = '8TmBDo5SkEINsgvYPtTnwlNa1ix11aKQb0hLsdeJhbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

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