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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d549ef0c85756c2a33df6b95696177911e14f84e016160673032bccd964545' 
  AND token = 'NaXogp1ynAvtQpqNM4hJGESVfhKNZK1LlVAoHdC6jC0=' 
  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