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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a215d64bf6f9fc78ceaf66d62e4ee34591b74db8177e5920e3554e16c26348bd' 
  AND token = '5AP0R9124AQWIiSl9VAGDZHnd3BNu0OXs9qUfM205Bw=' 
  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