SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1c5e3e37c1d4bfdb57873c772f56823872a83283120ef4757cce91aff63ce4' 
  AND token = '6tp2/wpbTi5PoCXIq4wYBJVvcq3Msj6EBGRIC/nqxvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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