SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c46493b6022976ca0f77fac2b33eb5c673f0bfa5d2bc024e4e248bc3896759' 
  AND token = 'N0VfajUGz2Cu9+yxhYE188p/l5JlZJqOGiEIHq/9Umw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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