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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0805040a9828c09103ebe7f0d932d69fd4e05e56f865cc1c9536c67d81ec3830' 
  AND token = 'Cekf32l7kJb1APNPAbRq2rU7tBdUOR48BEqOoKDxjp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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