SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489b358b55cf13026de788599943db2dede333e5162379f2e5681985fad7638e' 
  AND token = '9+AoGqKSquNw7r/2zkjHeQEQYcEhihZ/F87G7YbJ258=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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