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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5421c84bbb60a3229dfe12cba7c75429acb6955b258657c6da51ec29ecb7d833' 
  AND token = '6oR0mUUdbqqyZyC9voPfRqPeGmQZ8fmJfVTDhMxy3Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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