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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa425b90f3db5efae7695757991c0f05b59e870f34185bf49a1adb17a06377b7' 
  AND token = '9YiybwR9KBpwbw3VzPzLgZI+ySjEDXt1v7zt54FBBO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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