SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c683a2a0256d3ec056b7c9bbb764fe83fa62b02c506bba3364874ae49e17ca' 
  AND token = '3fhhrNBwThirJ8IlaqSDxLc1gqZ/W8AVwCqKF7ZH5R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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