Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9f28e6a436868d3d6402635b17426528a48d123660cbf65f42251ead908606' 
  AND token = 'VrYc6KsJtTPJ6oWL7jDPAr6oaB85PivjiYmzBkDQOaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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