Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29fe98e75bb23079e59ce1d452504faca91c3c269755829d998d383d9b247cf' 
  AND token = 'Jlbmhj/YyG+5RtfUBLqd9NNyPeEq1J+ES55z54jJ/wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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