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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e528c67b8737e35f056f6a81e693a221b97e7024f57ef9f5158fccb0303796f' 
  AND token = 'jzhUDlJHMSkjVmw1Gi80o/8rNhR40Bxo6mI0AMkBOZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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