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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca6e140753f1fa8737cc59717327021b124bb2e8a702ad8e787ee41f195de3e' 
  AND token = 'DysSxUiiTqcirHOySCfhBlrKHku0mT7pmjFwT1Y7xGY=' 
  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