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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb9468cf7171c1a231ee0f88743a05ed5d1f96d72d088337b65018b76d87c80' 
  AND token = '/A5HvJh7973TIGVB4C3jnvsrMh9SeEfAXZGo80RfI0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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