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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f04e2b5e13ae4a4a12231c803857c98f18cae0309bfa709714f17b9d238944' 
  AND token = 'MdkG7tuJSQQXwKZX8S/bFR3TH5vVx4MlyZBHnhyK990=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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