SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee6b8a14a61b186f725ff672d9b9e3381f7fba469c7dd4ecdf5c3abf27a85df' 
  AND token = 'hCl9raIkz+gK9PoCAVRTNOdQYlvybM1GZ13RLPXeTow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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