SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f170b07482a3914212e22522a973b3283cafedb86b3ac335176c75af035ff9' 
  AND token = 'b95qXFcwLiJKRsmQCaUDgK5zbhbFiXSUZiiMrhPBRCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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