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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e58a4e7dcfabe2bc9c0528a8664e3d0802b09e0c98ffd45f6014d9d0adc188' 
  AND token = 'pM1TtgINTBaMzhHEMNB6QGisZYe4jqexMAwaQYxG7e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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