Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3da661ad676cf0d8aa8a7896fb2f3974e6509fe2ca511e5a80d6a730deb5aa2' 
  AND token = 'dSypGfLBt32p2WD+5FfsuRBoS6GLo6BOlQo4Tndby8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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