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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1107025184d35b16a261962befca87fc596fc374d2f930e8ece32ed0735f8c59' 
  AND token = 'U6WV03JbLDQHaOcoc0eindl3It/JJy9ZL6vYseUN8MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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