SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017095316d13d5fe64ab8454e78acaa257ee80f7bedabf614899ad9f0a803ce5' 
  AND token = 'SvnF7XsXKbqP+0o6PV1z7+Rm15wdrvgN8JlGCiuugqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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