SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58530db9c07d0ab38368ddeb2e5e7a78a374bb2b42c5d5df85f615e78416c42' 
  AND token = 'Ubwr36OKOJKAvZqLSSmTGe+VgCW+g2bt2DN+99aspMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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