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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8e8ba89ae4cd78f12c431a224b6df18b2a0a57f760a5eb10b1dbafb8b995c3' 
  AND token = '9c+CQ9WrXDvr80sJ8ZBj3SI4bbpZeIDXFAkkVSbd5hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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