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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aef4416d09db40d868416b7bef7f47befcc779b1de2f8057fcc0ea851855807' 
  AND token = '2B4vFSlxl/Ygnl6BUDh6hbDlV8S9kaVkEjvscltvAqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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