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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a65958c3f8aadb9f7242e5cc719eb0dea04260303a4ddc1edbe1f876f7f5eea' 
  AND token = '1eS7onzkH/EbZ8deK+ZWUJtnEdEv5HJfGT44IIWFHGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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