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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234534030424f35ee31be213f51595cca0d008a245ad4ea318c4dc272bc85768' 
  AND token = 'IYOv7gW5hcZh08MN8gLJz7/EqAFJpVwbISPrLzJpfgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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