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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94580a21fcff6a3422a35b64e82f7158dd962044f8008b2a06f6cd3b64f1f25' 
  AND token = 'UOlIZJl6UXfKScaPaVT28Hud5y1stQO/XarvlgqMFC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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