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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769df65d96778af05e811523faa7084e3d47b7dbe2cbaad35bce5713fbd8c059' 
  AND token = 'xVugtNHtJzgQtzKlhd5t+7HqP1VQ12K0iSfBKa8P+SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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