SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2066954c6798421e3d9ec43d250c6c3c02f720818a79e4cb195cf2092b445d' 
  AND token = 'GFXTg+YhiOtQ5CLgHvH/xA8AevQFq5fz8iFaZ1nWOPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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