Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b8934b1d5a68dcc8c2e7545447976440439a7cd633801d1c892b5020840bff' 
  AND token = 'CUCpgUMBAb56amdwMVfAaMVngjGpb1b+jgH3LaDDwFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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