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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccfdfeab613cca39b75b55d59f955948d4b2db54f91ed7aa73e1c09d81e647b8' 
  AND token = 'sN99S9Li776429v6CexERSKa5GWtZqUJMvcd0A5AyoI=' 
  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