SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e587d096557a83d0bf4fc3395b1fd8428779c5207989edf533f1439d55474565' 
  AND token = 'yKdyXq1A8C1ShUNP/g02+8CALnggKuGQUhJObjwbj/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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