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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661af37e824c5a4ca8d48a564be1ca383e408a35b08f4dafb8fde807ae033d41' 
  AND token = 'X7qr7LTI1yiU6EOuW8FZ3x5ljeCqw3AfpIYxh6sSpJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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