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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e123dcc9746a7ee70ce854cb0ba6767fea361daaaca11c381a52f93a1a1c5fb3' 
  AND token = 'E/f1X2/2KJXuwkboOKFn1RJmiUl4mBbc4q6qMvsH25w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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