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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b775f1e54cd6df79c25f00a52360f2ab222b7e4ace4d5a486ad2ff0a2a75e97' 
  AND token = 'SuTk8Yt6zJw9ie3Nt9z8VFvAhWWiOI5xTuJB9JKOj+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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