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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7267e6e7c9572af3776c4ebc517935b8db9d54d5aa1adbd2e17dc717ba08bc96' 
  AND token = 'yHZBtJzhGjsQv3OlpdOi3jK7xxk5joXShCC9uzB70rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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