SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3331676a4c5dcf795fc838914d3205fe491fd1822b43ce17129dab89b00e7036' 
  AND token = 'l+EIbG7Zm1J6Mnwtk6qDZG1yUR9vIJPK8RsZtqAO2gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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