Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b98288b14fb6e89b96bb87e5660d4f20e46682decbb7859b158496a6b3c69f' 
  AND token = 'nPBqfMUnAz9VCyLlq+Z1gHRcuVRt/SF2dHsNfMCG0p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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