SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce8b7c407ec1a1997c3197705b1a495d097149c85db6548938519d8d8bc433b' 
  AND token = 'yHXJTc+JsvFj/4oWqWuRaNngmGCyzV6KWwGhP9g2Kl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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