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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6d5f758f9e103d6a63faa1f632181c5e4fb3fc69446a34d985d810e19a208d' 
  AND token = 'id7FoX4JcFk9csO5MsFbqislDO3wvyaidrdWhDZlgbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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