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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a91f0dfc634f85f9cbfd8e6ea361bc3573f81f9dc5973adf6a6835a490ba01' 
  AND token = 'CABRw/o4oXkqdGvaVo+D8ihE1p6LhaMa4ft7PIDzkRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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