SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9393125d0f03750513c28e37ff85161e0118e1de23fb824294a89b77a21e17d' 
  AND token = 'e4m6KbqKBBhiZFAgBN6oUD/9XOCRitBjGF+KZdShjSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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