SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfce894fbed17d88039260acd0ed70bbeac77306374233d2f46576fce7cbe72' 
  AND token = 'DX/GD/uipgACQZ6gyfhBmH/da/+5YWNjdgtJnzSjJ+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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