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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3634e6f74f829060d6fc19bbe5958ef8c91f6ce27ab61a9e4c75935c13e7aa49' 
  AND token = 'DkNFLk46zRgImp9uJikTcxyl0aRcWaknh4LIJSVgzdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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