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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d77aa3405ce64e33749892e2530326e11ea9c0d868fe03adf62b4b1768f79ee' 
  AND token = 'mB3W3C8XLcCDhNdSYKt/1s5g8oE9I6mAslImQAvdp64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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