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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ff3bb8910be4dbea072b8e32d6b19b900fde2d5c255e3d8b4671fd8589b76f2' 
  AND token = '1jokuyfR2ph52gumYatdAEGmE9G64z843JRbrLKorj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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