SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aacf175e6eb8ccc41fd3e6770ddeef96a65c62fc0f256727fa430698cb5fe32' 
  AND token = 'bMw3Q22wODKYsoBbzHOZf/LIJ/49HVrnqhzWkpE5lwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}