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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab272b081cf92eb29cb1ac4999f42fdfc9b650e7f42cfa3dfc49f29b63005caf' 
  AND token = '9aWL4mHUOcbc9Jmzpyya8mKLga3p9zplOtwtQis5clI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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