SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828bce661d884c86797c67d90d1f9beab0577d3c675b169fc84ac71a7f5c4939' 
  AND token = 'JoQVgrJ5N70qKxbBVIP3y3jo2auSYG5vXqUgUR1FdrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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