SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cedd11094f1d54ae04df869b1644987993709b332f4d58f8a7c38d80ac5b0e02' 
  AND token = 'ILDklJzPeQeBmvH/QccnPk2HgbjG4IBeGZS60RVh4nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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