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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc016d11a5ca708434afeedaf7132e53ae5286dfc75c59585ef6e0bcd956306' 
  AND token = 'DSIVX48of/VYlJb6fTz1a/vLGoOkKTrtyuOp80PI308=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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